I'm building a All City Space Horse with a a 105 front and rear hub, Tiagra triple crank (30/39/50t) et al. I'd like to use Campy veloce ergo levers because of their fit (plus they're a wee bit cheaper and maybe I'll switch to Campy when I have more money). Is this possible? I've read a lot of conflicting information online.

Since you already have the hub, you are locked into Shimano compatible cassettes.

If you decided to go all-Campy otherwise with the shifting components, which would be my suggestion, then a spacer kit or conversion cassette that has Shimano splining but Campy spacing is probably the best option. So you'd need to buy Campy triple shifters, FD and RD. The rest can be Shimano.

_________________There's sometimes a buggy.How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...and if you fix your attitude you can ride along with me.

Your setup will run an 8 speed Shimano cassette as is, or a 9 speed Shimano cassette if you attach the cable at the wrong side of the bolt on the RD, plenty of pictures of this if you google Shimergo. No need for Jteks unless you want a 10 speed cassette. (That requires 11 speed Campy shifters, if you want to so it without the Jtek).

I don't know where you found conflicting info, this works fine and has been done many times for many years. It's very common practice.

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